Comfort and Convenience
Cabin temperature is a good example: the setting one person finds pleasant can feel stuffy or chilly to the passenger beside them. Height, clothing and how long each has been sitting all play a part.
Safety and Driver Assistance
Before a long departure it is worth pausing to locate the essentials: mirrors, hazard lights, demister and horn. Learning where they are in a quiet car park is easier than working it out at motorway speed.
Multimedia and Connectivity
A phone used for navigation drains quickly, so keeping it powered matters on a long route. If a charging option is available on board, carrying the right cable or adapter for it avoids a flat battery mid-journey.